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The DW-100 burns files in the same format as they were originally recorded by your camcorder. The Canon Vixia HG-21 records in AVCHD--a high-definition format--which is completely different from standard-definition DVD and which is not compatible with regular DVD players (even though the disc itself is a standard DVD-R). As it states in the manual for the camcorder, "High-definition (AVCHD) discs created using the optional DW-100 DVD
Burner can be played back only with AVCHD-compatible DVD players."

The DW-100 is really more for archiving
your files in their native format than for creating standard DVDs that
can be played on regular DVD players. Regular (standard-definition) DVD players
can't play AVCHD, although many Blu-Ray players can. Unless you use a
Blu-Ray player that supports AVCHD playback, there are two solutions to
your problem:

1. If you want to keep your recordings high-def,
you can view them by playing them back with the DW-100, which must be
connected to your camcorder via the USB cable, then from your camcorder
to your TV via an HDMI cable.

2. If you want to have standard
DVDs that you can play on any DVD player, either import the files to
your computer and convert them to standard-definition using
video-editing software, then burn them to DVD with your computer's DVD
burner, or connect the analog output (component=better, composite=good)
to a stand-alone DVD recorder (i.e. not the DW-100).

I've used
the route of Vixia HF-10 camcorder > composite output > Panasonic
DMR-ES25S DVD recorder (about $65 used on eBay) with pretty good
results when I've wanted to give videos to relatives who don't have
Blu-Ray players. You just have to make sure to set the camcorder 's
analog (composite) output to 480i so that it formats the picture in the
right aspect ratio, or else the 16:9 image will be squeezed to 4:3
instead of letterboxed.